KR100782724B1 - A movable mold respondind to the bending of casting slab - Google Patents

Abstract

The present invention relates to a mold in which molten steel is solidified in a continuous casting process, and the casting direction is naturally shifted due to the bending of the cast steel to cope with the deformation of the cast steel so as to prevent quality defects such as internal cracks inside the cast steel. It relates to an inclined movable mold.

In the present invention, the cooling water is introduced into the inside of the main body, the outside is connected to the vibrator frame and the vibration is applied, and in the continuous casting mold to solidify the molten steel contained therein to produce a cast steel, the main body before and after Rotating shafts are respectively formed on the side surfaces, and the rotating shafts of the main body are mounted on the vibrator frame through a support frame which allows the inclination of the front, rear, left and right directions to be free, thereby drawing the center of the cast steel drawn to the bender side of the lower part of the main body. An inclined movable mold is configured to be tilted to conform to and to prevent deformation of the cast piece.

Vibrator frame, molten steel solidification, cast steel, continuous casting mold, bender

Description

Tilt-movable mold corresponding to deformation of cast steel {A MOVABLE MOLD RESPONDIND TO THE BENDING OF CASTING SLAB}

1 is an explanatory diagram showing a general playing process;

2 is a side view of a mold and bender device according to the prior art;

3 is an explanatory view showing the arrangement of the mold body and the bender in the mold according to the prior art,

         a) If the arrangement of mold body and bender is consistent,

         b) the arrangement of mold body and bender is mismatched;

4 is an explanatory diagram in which an internal crack of a cast steel produced in the playing process occurs;

5 is a perspective view showing an inclined movable mold according to the present invention;

6 is an external perspective view showing a mold body provided in an inclined movable mold according to the present invention.

         a) a front perspective view, b) a rear perspective view;

7 is an external perspective view of an inner support frame provided in an inclined movable mold according to the present invention;

8 is an external perspective view of an outer support frame provided in an inclined movable mold according to the present invention;                 

9 is an operational state diagram of the inclined movable mold according to the present invention,

         a) If the arrangement of mold body and bender is consistent,

         b) the arrangement of mold body and bender is mismatched;

         c) is a case where the mold main body is tilted to coincide with the arrangement center of the bender.

       <Description of the symbols for the main parts of the drawings>

10 ..... main body 12a, 12b .... rotary shaft

25 ..... Support frame part 30 ..... Inner support frame

40 ..... Shaft Fixture 50 ..... Outer Support Frame

60 ..... Shaft fixture 65 ..... Cover

100 .... ladle 110 .... tundish

120 .... Mold 127 .... Foot Roll

135 .... Bender 137 .... Guide Roll

B ..... Cast S ..... Molten Steel

The present invention relates to a mold in which molten steel is solidified in a continuous casting process, and more particularly, the casting direction is naturally shifted due to bending of the cast steel, thereby improving quality of the cast steel to prevent quality defects such as internal cracks inside the cast steel. It relates to a tiltable mold corresponding to the deformation.                         

In general, molten steel refined in the steelmaking process is transported to the ladle and transferred to the continuous casting process. In this playing process, the molten steel is cast and cooled in the shape of a cast steel, which first injects molten steel S carried by the ladle 100 into the tundish 110 as shown in FIG. In the dish 110, the molten steel S is introduced into the mold 120 while the molten steel amount is appropriately controlled. In the mold 120, the introduced molten steel S is cooled by using cooling water, and has a shape of a cast steel B to perform continuous solidification.

In the mold 120, the slab (B) whose surface is solidified continues to solidify while passing through the bender (135) at the lower side thereof, and after complete solidification, the slab (B) is cut to an appropriate length and transferred to a post process. will be.

On the other hand, in the mold 120, when the molten steel (S) is contained in the rectangular copper plate, which is the mold accommodating space 121, as shown in FIG. 2, the coolant flows into the cooling water space 122 outside the copper plate to the inside of the copper plate To cool the molten steel (S), accordingly, the molten steel (S) is solidified from the contact surface with the copper plate to form a solidification cell to have the shape of the cast steel (B), at this time to improve the quality of the molten steel (S) In order for the molten steel (S) to be solidified while stirring by the electromagnetic force molten steel stirring apparatus 125 mounted in the mold 120.

In this way, the surface of the mold 120 is solidified in the mold (B) is out of the mold (120) copper plate while the rapid cooling by direct contact of the coolant is made as the foot roll (Foot Roll) of the lower part of the mold (120) Solidification and drawing are continued while being supported by the guide roll 137 of the bender 127 and the bender 135. In addition, the vibration is continuously applied to the mold 120 by a vibration generator (not shown) which imparts vibration to the mold 120 outside of the mold 120, so that the drawing operation is smoothly performed.

On the other hand, the mold 120 as described above is not integrally formed with the bender 135 at the lower side thereof, and in the case of the bender 135, the mold 120 is mounted on a frame (not shown) by a separate hook (not shown) device. In the case of the mold 120, the mold 120 is mounted on a separate vibrator frame 145 without contacting the bender 135 and assembled with a fixing bolt 147.

Therefore, although the above two equipments are not integral with each other, workers need to be careful when assembling the equipment, but the arrangement in which the cast steel B passes between these two equipments has a very important influence on the quality of the cast steel B. As a result, efforts have been made to minimize errors in the arrangement of these devices during separation and assembly of equipment.

However, the continuous use of the equipment causes deformation in the arrangement between them, and arrangement errors between the equipment due to the external impact of the equipment generated during casting, and inaccuracies due to work errors during maintenance work of the operator to adjust this. The problem with an array was that it always existed. This arrangement error between the mold 120 and the bender 135 leads to a defect in the quality of the slab B. After casting, cracks in the slab B occur, or such cracks develop and solidify. Cracks are generated in the surface layer, and accordingly, it is a major cause of spillage of molten steel (S).

As such, when the arrangement of the two devices is inconsistent between the mold 120 and the bender 135, the state in which the crack is generated inside the cast B is as follows. That is, as shown in Figure 3, when the arrangement of the foot roll 127 of the mold 120 and the guide roll 137 of the bender 135 does not match, the drawing direction of the cast (B), that is, the vertical lower portion The rolls 127 and 137 resist laterally with respect to the pulling force in the direction so that an external force is generated in the freshly solidified portion of the slab B which contacts these rolls 127 and 137. As shown in FIG. 4), cracks P are generated under the solidification surface layer of the slab B, and these cracks P are continuously maintained until the completion of the slab B production.

On the other hand, the mold 120 and the bender 135 is a problem that it is difficult to always match exactly, no matter how precisely the arrangement of the workers, even if the arrangement is made of uneven cooling water is injected into the cast (B) Due to the cooling in the slab (B) is caused by the internal stress generated during the cooling in one direction will cause the bending phenomenon of the slab (B). Therefore, since the conventional mold 120 is fixedly mounted on the vibrator frame 145 even in such a bending phenomenon of the cast steel B, it cannot adequately cope with the bending of the cast steel B, and the foot roll 127 ) And the vendor guide roll 137 to apply an external force to the cast (B) to generate cracks (P) and the like inside the cast (B).

The present invention is to solve the conventional problems as described above, the object is that the casting direction is naturally moved by the bending phenomenon of the cast steel, it is possible to prevent the external force is applied to the cast, under the surface layer generated by the external force It is possible to prevent quality defects, such as cracks, and to provide an inclined movable mold corresponding to the deformation of the cast steel, which can be used to prevent molten steel leakage accidents such as cast cracks due to rapid growth of cracks. .

In order to achieve the above object, the present invention, the cooling water is introduced into the inside of the main body, the outside is connected to the vibrator frame and the vibration is applied, the continuous casting mold to solidify the molten steel contained therein to produce a cast steel In the main body, the rotating shaft is formed on the front, rear and outer sides, respectively, the rotating shaft of the main body is mounted on the vibrator frame through the support frame to be freely inclined in the front, rear, left and right directions by the lower body By tilting to match the drawing center of the cast steel drawn to the side of the vendor of the inclined movable mold, characterized in that configured to prevent deformation of the cast steel.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

As shown in FIG. 5, the inclined movable mold 1 corresponding to the deformation of the cast steel according to the present invention has a coolant introduced therein, and the outside of which is connected to the vibrator frame 145 so that vibration is applied. The main body 10 of the structure is provided, and the molten steel S contained in the inside of the main body 10 is solidified to produce the cast steel B.

In addition, the main body 10 is formed on the front and rear outer shaft 12a, 12b, respectively, and the rotation shaft 12a, 12b of the main body 10 before and after the vibrator frame 145 And it is mounted through the support frame portion 25 to be free to tilt left and right, the support frame portion 25 is supported before and after the rotation shaft 12a, 12b of the main body 10, respectively The inner support frame 30 to which the members 34a and 34b are rotatably connected, and the outer support frame which rotatably supports the inner support frame 30 back and forth from the outside of the inner support 30. Has 50.

The inner support frame 30 is a rectangular structure surrounding the main body 10 of the mold 120 from the outside, the front, rear, left, right support members 34c (34d) are connected to each other to form a structure, In the middle of the front and rear support members 34a and 34b of the four support members, as shown in FIG. 7, the shaft fasteners to which the rotation shafts 12a and 12b of the mold main body 10 are rotatable. 40 are each formed.

The shaft fixture 40 forms semi-circular grooves 41 in the middle of the front and rear support members 34a and 34b, and covers the cover 45 formed with the semi-circular grooves 42 to cover the bolts 47. By fixing the rotation shaft 12a, 12b of the main body 10, the main body 10 mounted on the inner support frame 30 is the rotation shaft 12a with respect to the inner support frame 30 Centering on (12b), the left and right social movements are possible.

In addition, the outer support frame 50 to which the inner support frame 30 is mounted to be capable of tilting forward and backward is formed larger than the inner support frame 30, and supports left and right sides of the inner support frame 30. In the middle of the left and right support members 54a and 54b, a shaft support 60 for rotatably fixing the rotation shafts 32a and 32b extending outwardly from the members 34c and 34d is rotated. Form.

The outer support frame 50 also has a shape similar to the inner support frame 30, the outer support frame 50 is one end of the left and right support members 54a, 54b instead of one support member is a vibrator The vibration is transmitted to the mold body 10 is fixed to the frame 145 is transmitted to the mold body 10, and is configured to maintain the level of the mold 120.

The shaft supporters 60 formed on the left and right support members 54a and 54b of the outer support frame 50 are also supported left and right as the shaft supporter 40 of the inner support frame 30. The groove 61 is formed in the middle of the members 54a and 54b, and the cover 65 having the groove 62 formed to correspond to the groove 61 is fixed as the bolt 67 to support the inner support frame. The rotating shafts 32a and 32b of the 30 are fixed to be rotatable.

Therefore, the inner support frame 30 is configured to be capable of tilting forward and backward about the rotation shafts 32a and 32b with respect to the outer support frame 50. On the other hand, the shaft support 40, 60 through the bearing member (not shown) between the rotating shaft 12a, 12b, 32a, 32b fixed to the center is made more smooth rotation You can lose.

Reference numeral 80 is a socket for supplying power to the electronic stirrer embedded in the mold body, and 82 is a cooling water connection socket for introducing the cooling water into the cooling water receiving space in the body.

 The tiltable movable mold 1 corresponding to the deformation of the cast steel according to the present invention configured as described above has a rotating shaft 12a in which the main body 10 is located inward of the inner support frame 30 and protrudes from the front and rear outer surfaces thereof. (12b) are rotatably mounted to the shaft support 40 provided in the middle of the front and rear support members (34a, 34b) of the inner support frame 30, respectively, the main body 10 and the inner support frame The rotation shafts 32a and 32b which are positioned inward of the outer support frame 50 and protruded to the outside of the left and right support members 34c and 34d of the inner support frame 30 are the outer support frame ( 50 is rotatably mounted to the shaft support 60 provided in the left and right support members 54a and 54b.

Then, while the vibration is transmitted from the vibrator frame 145, the coolant is introduced into the main body 10, the molten steel (S) is contained in the molten steel space 125 formed in the center of the main body 10 The slab B solidified on the lower side bender 135 of the mold main body 10 is drawn out.

That is, as shown in Fig. 9a), when the mold 120 and the bender 135 at the bottom thereof are in a straight line with each other and the drawing centers of the cast steel B coincide with each other, the cast steel B is externally located. When no external force is applied, no crack is generated inside the cast steel B. However, if the drawing center of the mold 120 and the drawing center of the bender 135 do not coincide with each other as shown in FIG. The external force from the foot roll 127 under the mold main body 10 and the upper guide roll 137 of the bender 135 is applied to the slab B.

In this case, since the mold main body 10 is fixed to the vibrator frame 145 in a fixed state so as to be able to rotate forward, backward, left, and right through the support frame 25, it is shown in FIG. 9C). As described above, according to the drawing force of the cast steel (B) to be drawn to the lower side of the bender 135 is moved in any of the front, rear, left, and right directions, the state thus moved to the mold body 10 The casting center of cast iron (B) from and the casting center of cast iron (B) from bender 135 coincide with each other, resulting in minimizing external force exerted on the cast iron (B) from the outside.                     

 Accordingly, cracks are prevented in the cast steel (B), which prevents accidental leakage of molten steel (S) such as the cast fire during the casting operation.

According to the present invention as described above, in the continuous casting operation, when the alignment error between the mold main body 10 and the bender 135 occurs, or due to the cooling non-uniformity of the cast (B), the internal stress is partially biased cast When the warp of (B) occurs, the mold main body 10 is inclined so as to coincide with the drawing direction of the bender 135 and coincides with the drawing direction, so that the foot roll 127 and the bender 135 of the mold main body 10 are aligned. External force applied to the cast steel (B) in the guide roll 137, etc.) is minimized.

Therefore, it is possible to prevent the degradation of the internal quality by minimizing the subsurface cracks of the cast (B), and the unsolidified molten steel (S) inside the cast (B) flows out to the outside due to the continuous rapid propagation of the crack due to uneven cooling. It is possible to obtain an excellent effect of preventing equipment accidents such as cast slab bursting in advance.

Claims (4)

Cooling water flows into the main body 10, and the outside is connected to the vibrator frame 145 to vibrate, and the continuous casting mold solidifies the molten steel S contained therein to produce the slab B. In the main body 10, the rotating shafts 12a and 12b are formed on the front and rear outer surfaces, respectively, and the rotating shafts 12a and 12b of the main body 10 are formed on the vibrator frame 145. Since the inclined rotation in the rear and left and right directions is mounted through the support frame portion 25, the inclined rotation is performed so as to coincide with the drawing center of the cast steel B drawn out to the side of the bender 135 under the main body 10. A tiltable mold which is configured to prevent deformation of (B). The inner support frame of claim 1, wherein the support frame portion 25 is rotatably connected to the front and rear support members 34a and 34b to the rotation shafts 12a and 12b of the main body 10, respectively. And an outer support frame (50) rotatably supporting the inner support frame (30) before and after the outer support frame (30) outside the inner support frame (30). According to claim 2, The inner support frame 30 is the front, rear, left, right support members 34c (34d) are connected to each other to surround the main body 10 of the mold 120 to form a structure In the middle of the front and rear support members (34a, 34b) of the four support members, each of the shaft fasteners (40) which can be mounted so that the rotating shafts (12a, 12b) of the mold body 10 is rotatable Each is formed; The outer support frame 50 to which the inner support frame 30 is mounted so as to be tilted forward and backward may be formed larger than the inner support frame 30, and the left and right support members of the inner support frame 30 may be A shaft support 60 is formed in the middle of the left and right support members 54a and 54b for rotatably fixing the rotation shafts 32a and 32b extending outwardly from 34c and 34d, respectively. One end of the left and right support members 54a and 54b may be fixed to the vibrator frame 145 to transmit external vibration to the mold body 10 and maintain the level of the mold 120. It is configured to be tiltable movable mold. The cover 45 of claim 3, wherein the shaft fixture 40 forms semi-circular grooves 41 in the middle of the front and rear support members 34a and 34b and forms the semi-circular grooves 42 to cover the cover 45. ) As a bolt 47 to fix the rotation shaft (12a) (12b) of the main body 10, the main body 10 mounted on the inner support frame 30 is the inner support frame 30 Swivelable mold, characterized in that while forming a structure capable of left, right, right and left social movement around the rotation axis (12a) (12b), the shaft fixture (60) has the same structure in the shaft fixture (40).

Images